body {
		height: 100%;
		margin: 2px;
		padding: 0;
		background-color: #ffffff;
      }
.center {
      position: absolute;
      top: 50%;
      left: 50%;
      height: 100px;
      width: 400px;
      margin-top: -50px;
      margin-left: -200px;
      text-align: center;
      }
a img 
{
        opacity:0.8; 
        -moz-opacity:0.8; 
        filter:alpha(opacity=80);
        border: none;
}
a:hover img 
{
        opacity:1.0; 
        -moz-opacity:1.0; 
        filter:alpha(opacity=100);
        border: none;
}